Move global admin controllers from Admin to SuperAdmin namespace

Backup, Update, Modules, and global Settings controllers (mail config,
PDF config, disk management, global settings) are application-wide features
not scoped to a company. Move them from Admin/ to SuperAdmin/ to match the
v3.0 UI structure where these live under Administration.

Company-scoped settings controllers remain in Admin/Settings/.

app/Http/Controllers/V1/SuperAdmin/Update/UpdateController.php

@@ -0,0 +1,102 @@
+<?php
+
+namespace App\Http\Controllers\V1\SuperAdmin\Update;
+
+use App\Http\Controllers\Controller;
+use App\Models\Setting;
+use App\Services\Update\Updater;
+use Illuminate\Http\Request;
+
+class UpdateController extends Controller
+{
+    public function download(Request $request)
+    {
+        $this->authorize('manage update app');
+
+        $request->validate([
+            'version' => 'required',
+        ]);
+
+        $path = Updater::download($request->version);
+
+        return response()->json([
+            'success' => true,
+            'path' => $path,
+        ]);
+    }
+
+    public function unzip(Request $request)
+    {
+        $this->authorize('manage update app');
+
+        $request->validate([
+            'path' => 'required',
+        ]);
+
+        try {
+            $path = Updater::unzip($request->path);
+
+            return response()->json([
+                'success' => true,
+                'path' => $path,
+            ]);
+        } catch (\Exception $e) {
+            return response()->json([
+                'success' => false,
+                'error' => $e->getMessage(),
+            ], 500);
+        }
+    }
+
+    public function copyFiles(Request $request)
+    {
+        $this->authorize('manage update app');
+
+        $request->validate([
+            'path' => 'required',
+        ]);
+
+        $path = Updater::copyFiles($request->path);
+
+        return response()->json([
+            'success' => true,
+            'path' => $path,
+        ]);
+    }
+
+    public function migrate(Request $request)
+    {
+        $this->authorize('manage update app');
+
+        Updater::migrateUpdate();
+
+        return response()->json([
+            'success' => true,
+        ]);
+    }
+
+    public function finishUpdate(Request $request)
+    {
+        $this->authorize('manage update app');
+
+        $request->validate([
+            'installed' => 'required',
+            'version' => 'required',
+        ]);
+
+        $json = Updater::finishUpdate($request->installed, $request->version);
+
+        return response()->json($json);
+    }
+
+    public function checkLatestVersion(Request $request)
+    {
+        $this->authorize('manage update app');
+
+        set_time_limit(600); // 10 minutes
+
+        $json = Updater::checkForUpdate(Setting::getSetting('version'));
+
+        return response()->json($json);
+    }
+}